double bassoon 
noun
A bassoon that is larger and longer than the normal type and sounds an octave lower in pitch.It once fell to my lot to play the double-bassoon in Haydn's Creation.
- trophosphere
- trophospongia
- trophospongial
- trophotaxis
- trophothylax
- trophotropic
- trophotropism
- trophozoite
- trophozooid
- trophus
- trophy
- -trophy
- trophy badge
- trophy bearer
- trophy child
- trophy decoration
- trophy flag
- trophy hunter
- trophy hunting
- trophyless
- trophy lock
- trophy money
- trophy race
- trophy tax
- trophy wife